Early music is Western classical music prior to the Baroque era,[1] comprising Medieval music (500–1400) and the Renaissance music (1400–1600). According to the UK's National Centre for Early Music, the term "early music" refers to both a repertory (European music written between 1250 and 1750 embracing Medieval, Renaissance and the Baroque) – and an historically informed approach to the performance of that music.[2] However, today this term has come to include "any music for which a historically appropriate style of performance must be reconstructed on the basis of surviving scores, treatises, instruments and other contemporary evidence."[3]

According to Margaret Bent, "Renaissance notation is under-prescriptive by our standards; when translated into modern form it acquires a prescriptive weight that overspecifies and distorts its original openness. Accidentals … may or may not have been notated, but what modern notation requires would then have been perfectly apparent without notation to a singer versed in counterpoint".[4]

^Bent, Margaret. 1998. "The Grammar of Early Music: Preconditions for Analysis", p. 25. In Tonal Structures in Early Music, edited by Cristle Collins Judd, 15–59. Garland Reference Library of the Humanities 1998; Criticism and Analysis of Early Music 1. New York: Garland Publishing. ISBN 0-8153-2388-3.